Teotihuacán Civilization (100 BCE – 550 CE)
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• The city was carefully planned, featuring a grid-like layout, advanced drainage systems, and massive pyramids.
• The Pyramid of the Sun and the Pyramid of the Moon are among its most famous landmarks. These massive structures were used for religious ceremonies and astronomical observations.
• The Avenue of the Dead was the city's main road, lined with important temples and palaces.
• The civilization mysteriously declined around 550 CE, possibly due to internal unrest, climate change, or invasions. However, its architecture and religious ideas influenced later cultures like the Aztecs.

